GMO is basically genetically modified organisms and farmers and scientists do this and so do engineers. What they basically do is that they get the DNA of another food/ plant/ animal and they make duplicates of them. The reason they do this may be because foods or plants really look better, taste better and is better overall. This is just one reason there are many more reasons.
Now WHERE have we seen it? When you go grocery shopping, some products have a over saying NON GMO or GMO FREE or they might as well just state that it’s a GMO product.